Abstract
In this paper, we present the generation, the detection and the
performance evaluation of a novel return-to-zero frequency shift keying
(RZ-FSK) format for 40 Gb/s transmission. Non-return-to-zero (NRZ) FSK
signal is generated by using two continues-wave (CW) lasers, one
Mach–Zehnder modulator (MZM) and one Mach–Zehnder delay
interferometer (MZDI). A RZ-FSK signal is successfully generated by
cascading a dual-arm MZM, which is driven by a sinusoidal voltage at half of
the bit rate. The demodulation can be simply achieved on 1 bit rate through
one MZDI or an array waveguide grating (AWG) demultiplexer with balanced
detection. By numerical simulation, two types of frequency modulation
schemes using MZM or PM, and impact of the frequency tone spacing (FTS) of
the generated FSK signal are discussed. The proposed scheme shows that the
novel frequency modulation format offers a few transmission advantages
comparing with than that of the other traditional modulation formats, such
as RZ and differential phase-shift keying (DPSK), under varying dispersion
management. The performance analysis of RZ-FSK signal in a 4$\,{\times}\,$40 Gb/s WDM transmission system is introduced. We experimentally
demonstrate, transparent wavelength conversion based on four-wave mixing
(FWM) in a semiconductor optical amplifier (SOA) and in a highly nonlinear
dispersion shifted fiber (HNDSF) for a 40 Gb/s RZ-FSK signal, clearly
validating the feasibility of all optical signal processing of high-speed
RZ-FSK signal. Moreover, we investigate the receiver power penalty for the
RZ-FSK signal after a 100 km standard single-mode fiber (SMF) transmission
link with matching dispersion compensating fiber (DCF), under the
post-compensation management scheme. Since the frequency modulation format
is orthogonal to intensity modulation and vector modulation (polarization
shift keying), it can be employed in the context of the combined modulation
format to decrease the data rate or enhance the symbol rate. It can also be
utilized in the orthogonal label-switching as the modulation format for the
payload or the label.
© 2010 IEEE
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